In the last summer before embarking on her journey to study abroad, eighteen-year-old Chen Xi returns to her hometown to bid farewell to the familiar fishing village that holds so many memories. Standing before the vast ocean, Chen Xi finds herself caught in a whirlwind of emotions. The sea, a symbol of freedom, also feels like an invisible cage. Everything she once cherished now seems as insignificant as grains of sand in the face of her growing maturity.